Angle that is smaller than a right angle (less than 90Â°). Angle formed by two lines or two perpendicular planes that measures 90Â°. Symbol denoting that a straight line meets another at a right angle. Symbol denoting that two straight lines do not remain at a constant distance from one other. Symbol denoting that two straight lines remain at a constant distance from one another.
Constriction vs. Dilation. Constriction and dilation are opposite, but related, processes in the body. Whereas dilation is an opening or widening of a structure or passageway to increase material flow, constriction leads to a decrease in material flow by closing the passage.
Run in the opposite direction! Go the other way! Opposite is an adjective that describes something found on the exact other side of a spaceâor even an idea. You say black, I say white: we're on opposite sides of the debate. You might notice the similarity of opposite to the nouns opponent and opposition or to the verb oppose.